won't start when it is left for a prolonged period i.e park up after work 5pm won't start in the morning with out a bump start , rest of the day when using it it starts fine and runs fine. I have had it in the garage as the first time it struggled to start it was frosty so I assumed glow plugs , they cannot remove as a alan bolt has been rouned off , the advice I got was to try pumping the small push button to prime the fuel, This has had no affect 73k on clock w reg well serviced ..